CI: use `rustsec/audit-check@v2` (#457) #299

Job	Run time
build (1.65.0, thumbv7em-none-eabi)	1m 12s
minimal-versions	0s
build (1.65.0, wasm32-unknown-unknown)	1m 13s
test (1.65.0)	1m 23s
build (stable, thumbv7em-none-eabi)	16s
test (stable)	18s
build (stable, wasm32-unknown-unknown)	19s
	4m 41s

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